cross-shadow-boundary-slot-1-ref.html

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<!doctype html>

<span id="outer">Outer</span>

<div>

  <span id="slotted">Slotted</span>

  <span id="inner">Inner</span>

</div>

<script>

  window.getSelection()

      .setBaseAndExtent(outer.firstChild, 3, slotted.firstChild, 4);

  const range = new Range();

  range.selectNode(inner);

  window.getSelection().addRange(range);

</script>